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Improved Hybrid Modulation Strategy for MMC with Auxiliary Sub-modules
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Guangyuan YANG1, Shijia ZHOU2, Guangqiang PENG1, Jiyang WU1, Qingming XIN2, Shukai XU2
Journal of Power Supply | 2024, 22(1) : 74 - 82
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Journal of Power Supply | 2024, 22(1): 74-82
• AC-DC Converters •
Improved Hybrid Modulation Strategy for MMC with Auxiliary Sub-modules
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Guangyuan YANG1, Shijia ZHOU2, Guangqiang PENG1, Jiyang WU1, Qingming XIN2, Shukai XU2
Affiliations
  • 1 Maintenance & Test Center China Southern Power Grid EHV Power Transmission Company Guangzhou 510663 China
  • 2 China Southern Power Grid Research Institute Co., Ltd. Guangzhou 510080 China
Published: 2024-01-30 doi: 10.13234/j.issn.2095-2805.2024.1.74
Outline
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The traditional nearest level modulation (NLM) has advantages of simple control and low switching frequency. However, when the number of output levels is small, the harmonic distortion rate of output waveform from a modular multilevel converter(MMC) under the NLM modulation will be large. In this paper, a full-bridge auxiliary sub-module is added to each arm of the traditional three-phase six-leg MMC topology, and the capacitance voltage of the auxiliary sub-module is half of that of the half-bridge sub-module. Aimed at this MMC topology, an improved hybrid modulation strategy is proposed, which can realize the balance control of half-bridge and auxiliary sub-module, reduce the harmonic distortion rate of MMC AC-side output current, and reduce the switching frequency and system loss of the full-bridge sub-module. A detailed simulation model is built in MATLAB/Simulink, and simulation results verify the effectiveness of the proposed MMC topology and the improved hybrid modulation strategy.

Modular multilevel converter (MMC)  /  hybrid modulation  /  balance control  /  frequency reduction control
Guangyuan YANG, Shijia ZHOU, Guangqiang PENG, Jiyang WU, Qingming XIN, Shukai XU. Improved Hybrid Modulation Strategy for MMC with Auxiliary Sub-modules[J]. Journal of Power Supply, 2024 , 22 (1) : 74 -82 . DOI: 10.13234/j.issn.2095-2805.2024.1.74
Funding
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  • Science and Technology Projects of China Southern Power Grid(ZBKJXM20180560)
  • National Natural Science Foundation of China(51977070)
Appendix
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Year 2024 volume 22 Issue 1
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Article Info
doi: 10.13234/j.issn.2095-2805.2024.1.74
  • Receive Date：2021-01-13
  • Online Date：2025-07-21
  • Published：2024-01-30
Article Data
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History
  • Received：2021-01-13
  • Revised：2021-02-28
  • Accepted：2021-03-30
Funding
Science and Technology Projects of China Southern Power Grid(ZBKJXM20180560)
National Natural Science Foundation of China(51977070)
Affiliations
    1 Maintenance & Test Center China Southern Power Grid EHV Power Transmission Company Guangzhou 510663 China
    2 China Southern Power Grid Research Institute Co., Ltd. Guangzhou 510080 China
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https://castjournals.cast.org.cn/joweb/dyxb/EN/10.13234/j.issn.2095-2805.2024.1.74
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